Abstract
Hydrogeochemical evaluation of aquifers belonging to Chimakurthy granitic pluton complex reveals wide spatial and temporal variation in F- distribution. F- concentration in groundwater of different aquifers varies from 1in almost all the samples of three sampling sessions establish silicate weathering. Ca2+/Mg2+, Na+/Ca2+, Ca2+, Mg2+ and HCO3- ratios authenticate carbonate dissolution is responsible for alkali earths addition. Sodic rich and calcium depleted water together with balanced alkalinity has enabled F- enrichment. Presence of fluorite as accessory mineral apart from occurrence of F- in mineral lattice of biotite, hornblende, muscovite, and pyroxene were the potential sources of F- to the percolating pore waters. Though F- was abundantly available in solid solution the receptive hydrochemical character of solute was governing the F- adsorption which could be one of the strong reasons for uneven distribution of F- with in similar petrological setup. Key words: Water-rock interaction, fluoride, groundwater, Chimakurthy, gabbro, hydrogeochemistry.
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